CN112485002B - Rack construction method, rack and test method for testing NVH (noise, vibration and harshness) of power assembly - Google Patents
Rack construction method, rack and test method for testing NVH (noise, vibration and harshness) of power assembly Download PDFInfo
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- CN112485002B CN112485002B CN202011287115.5A CN202011287115A CN112485002B CN 112485002 B CN112485002 B CN 112485002B CN 202011287115 A CN202011287115 A CN 202011287115A CN 112485002 B CN112485002 B CN 112485002B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a rack building method, a rack and a testing method for testing NVH (noise, vibration and harshness) of a decomposition power assembly, wherein the rack building method comprises the following steps: centering the engine and the first dynamometer, and connecting the engine to one end of a rotating shaft of the first dynamometer through a first transmission shaft; the coaxiality limiting tool is aligned with the first dynamometer, a first end of a second transmission shaft in the coaxiality limiting tool is connected to the other end of a rotating shaft of the first dynamometer through a flexible transmission shaft, a second end of the second transmission shaft is connected to a gearbox, and the coaxiality limiting tool is used for ensuring the coaxiality of the gearbox and the first dynamometer; a differential is coupled to the transmission, the differential being coupled to a first end of the axle shaft, a second end of the axle shaft being coupled to a second dynamometer. The invention can independently test the NVH performance of the engine under the condition of real gearbox load.
Description
Technical Field
The invention relates to the field of vehicles, in particular to a rack construction method, a rack and a test method for testing NVH (noise, vibration and harshness) of a decomposition power assembly.
Background
The vehicle power assembly refers to a series of component assemblies on a vehicle for generating power and transmitting the power to a road surface. Typically, the powertrain includes an engine, a transmission, and the remaining components integrated into the transmission. The performance test of the power assembly NVH (Noise, Vibration, Harshness) is an important decomposition means for the performance test of the entire vehicle NVH.
In the related art, the NVH performance test of the powertrain generally includes: 1) the engine is directly connected with the gearbox, the output end of the gearbox is directly connected with the first dynamometer, and the NVH performance test of the engine and the gearbox during integrated operation is met through the building mode of the test bench; 2) the method comprises the following steps of (1) carrying out an NVH performance test on a gearbox alone, wherein an engine and the gearbox are required to be separated, and a dynamometer is connected with the gearbox for testing; 3) the engine is required to be separated from the gearbox in the independent NVH performance test of the engine, the dynamometer is connected with the engine, the dynamometer is used for simulating the load change of the gearbox, and the engine is tested at the same time.
The research on the NVH performance of the engine alone has very important significance on the research on the NVH performance of the whole vehicle. When the independent NVH performance of the engine is tested at present, the load change of the side of the gearbox can be simulated only through the dynamometer, and due to the limitation of the dynamometer, the dynamometer cannot simulate the load change of various gearboxes more truly and accurately, so that the independent NVH performance of the engine cannot be comprehensively and truly reflected in the existing test.
Disclosure of Invention
In view of the above, the invention provides a rack building method, a rack and a testing method for testing NVH (noise, vibration and harshness) of a split power assembly, which can be used for independently testing the NVH performance of an engine under the condition of a real gearbox load.
Specifically, the method comprises the following technical scheme:
in a first aspect, an embodiment of the present invention provides a rack construction method for measuring NVH of a split powertrain, where the method includes:
centering an engine and a first dynamometer, and connecting a flywheel of the engine to one end of a rotating shaft of the first dynamometer through a first transmission shaft;
the method comprises the steps that a coaxiality limiting tool is centered with a first dynamometer, a first end of a second transmission shaft in the coaxiality limiting tool is connected to the other end of a rotating shaft of the first dynamometer through a flexible transmission shaft, and a second end of the second transmission shaft is connected to a gearbox;
a differential is coupled to the gearbox, the differential being coupled to a first end of an axle shaft, a second end of the axle shaft being coupled to a second dynamometer.
Optionally, the coaxiality limiting tool comprises a tool base frame for mounting the second transmission shaft, and the tool base frame comprises a horizontal bottom plate, a vertical mounting plate, a positioning plate, a thrust bearing and a bearing seat;
the vertical mounting plate is connected to the horizontal bottom plate and is perpendicular to the horizontal bottom plate, the positioning plate is connected to the vertical mounting plate, mounting holes are formed in the vertical mounting plate, shaft holes are formed in the positioning plate, the shaft holes in the positioning plate are aligned with a rotating shaft of the first dynamometer, and the second transmission shaft penetrates through the shaft holes in the positioning plate and the mounting holes in the vertical mounting plate and is positioned through the shaft holes in the positioning plate;
the thrust bearing is arranged on the second transmission shaft, and the bearing seat is arranged outside the thrust bearing and connected to the positioning plate.
Optionally, the spacing frock of axiality still includes transfer crack axle sleeve and flange dish, the flange dish sets up the second end department of second transmission shaft and with the suit is in on the second transmission shaft transfer crack axle sleeve connection, transfer the crack axle sleeve with the second transmission shaft is fixed each other in week, transfer the crack axle sleeve can move in the axial direction of second transmission shaft, in order to adjust the flange dish is in the ascending position of the axial direction of second transmission shaft, transfer the crack axle sleeve through the parallel key with the second transmission shaft is fixed each other in week to through tight set bolt locking transfer the crack axle sleeve in the ascending position of the axial direction of second transmission shaft.
Optionally, the gap adjusting shaft sleeve and the second transmission shaft are located on the same axis, and the gap adjusting shaft sleeve is perpendicular to the flange.
In a second aspect, the embodiment of the invention further provides a rack for measuring NVH of a decomposed power assembly, which is characterized in that the rack comprises a first transmission shaft, a first dynamometer, a dynamometer mounting table, a coaxiality limiting tool, an engine mounting frame, a gearbox mounting frame and a second dynamometer;
the first dynamometer is mounted on the dynamometer mounting table;
the coaxiality limiting tool comprises a tool base frame and a second transmission shaft arranged on the tool base frame;
the engine mounting rack is suitable for placing an engine, the gearbox mounting rack is suitable for placing a gearbox, one end of a rotating shaft of the first dynamometer is suitable for being connected with the engine through the first transmission shaft, the other end of the rotating shaft of the first dynamometer is connected with the first end of the second transmission shaft through a flexible transmission shaft, and the second end of the second transmission shaft is suitable for being connected with the gearbox;
the first transmission shaft, the rotating shaft of the first dynamometer, the flexible transmission shaft and the second transmission shaft are positioned on the same axial line;
a differential is connected to the transmission, the differential being connected to a first end of an axle shaft, a second end of the axle shaft being connected to a second dynamometer.
Optionally, the tool base frame comprises a horizontal bottom plate, a vertical mounting plate, a positioning plate, a thrust bearing and a bearing seat;
the vertical mounting plate is connected to the horizontal bottom plate and is perpendicular to the horizontal bottom plate, the positioning plate is connected to the vertical mounting plate, mounting holes are formed in the vertical mounting plate, shaft holes are formed in the positioning plate, the shaft holes in the positioning plate are aligned with a rotating shaft of the first dynamometer, and the second transmission shaft penetrates through the shaft holes in the positioning plate and the mounting holes in the vertical mounting plate and is positioned through the shaft holes in the positioning plate;
the thrust bearing is arranged on the second transmission shaft, and the bearing seat is arranged outside the thrust bearing and connected to the positioning plate.
Optionally, the spacing frock of axiality still includes transfer crack axle sleeve and flange dish, the flange dish sets up the second end department of second transmission shaft and with the suit is in on the second transmission shaft transfer crack axle sleeve connection, transfer the crack axle sleeve with the second transmission shaft is fixed each other in week, transfer the crack axle sleeve can move in the axial direction of second transmission shaft, in order to adjust the flange dish is in the ascending position of the axial direction of second transmission shaft, transfer the crack axle sleeve through the parallel key with the second transmission shaft is fixed each other in week to through tight set bolt locking transfer the crack axle sleeve in the ascending position of the axial direction of second transmission shaft.
Optionally, the gap adjusting shaft sleeve and the second transmission shaft are located on the same axis, and the gap adjusting shaft sleeve is perpendicular to the flange.
In a third aspect, an embodiment of the present invention further provides a method for testing NVH performance of an engine, where the test method is performed by using the above-mentioned rack for testing NVH performance by using a power assembly.
In a fourth aspect, an embodiment of the present invention further provides a method for testing NVH performance of a transmission, which is performed by using the above-mentioned rack for testing NVH performance by using a split powertrain.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
according to the invention, under the condition of ensuring the coaxiality of the engine and the first dynamometer, the coaxiality between the first dynamometer and the gearbox is ensured through the coaxiality limiting tool, so that the coaxiality between the engine and the gearbox is ensured, the signal synchronization of the engine and the gearbox is realized, the NVH performance of the engine can be independently tested under the condition of loading of a real gearbox, and the NVH performance of the engine can be more comprehensively and truly reflected by a test result.
The first dynamometer is connected with the second transmission shaft of the coaxiality limiting tool through the flexible transmission shaft, and due to the fact that the gear shifting action exists in the gearbox, the torque is possibly too large, and the flexible transmission shaft can effectively protect the service life of an internal rotating shaft and a bearing of the dynamometer.
The clearance adjusting shaft sleeve arranged on the second transmission shaft can move in the axial direction of the second transmission shaft, and the flange connected with the clearance adjusting shaft sleeve is used for moving and limiting a clutch or a hydraulic torque converter in the gearbox, so that the clearance between the clutch or the hydraulic torque converter and the gearbox shell is adjusted, and interference friction between the clutch or the hydraulic torque converter and the gearbox shell is avoided during rotation.
The NVH performance of the gearbox can be tested independently by the method.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a block diagram of a stand for decomposing NVH of a powertrain according to an embodiment of the present invention.
Fig. 2 is a schematic structural view of a coaxiality limiting tool according to an embodiment of the invention.
Fig. 3a and 3b are schematic diagrams illustrating the positioning requirement and the coaxiality requirement of the coaxiality limiting tool according to the embodiment of the invention.
The reference numerals in the figures are denoted respectively by:
1-an engine;
2-a first transmission shaft;
3-a first dynamometer;
4-a flexible transmission shaft;
5-coaxiality limiting tool; 501-a second transmission shaft; 502-horizontal floor; 503-vertical mounting plate; 504-positioning plate; 5041-shaft hole; 5042-a bearing housing bore; 505-a thrust bearing; 506-a bearing seat; 507-gap adjusting shaft sleeves; 508-flange plate; 509-flat bond; 510-tightening the bolt;
6-a gearbox;
7-a differential;
8-half shaft;
9-a second dynamometer.
With the above figures, certain embodiments of the invention have been illustrated and described in more detail below. The drawings and the description are not intended to limit the scope of the inventive concept in any way, but rather to illustrate it by those skilled in the art with reference to specific embodiments.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Before the embodiments of the present invention are described in further detail, terms of orientation such as "above", "below", "upper", "lower", "upward", "downward", "inner", "outer", "inward", "outward", "inner", "outer", "front", "rear", "forward" and "rearward" referred to in the examples of the present invention are used to describe features of the exemplary embodiments with reference to the positions of the features shown in the drawings, and do not have a meaning of limiting the scope of the present invention.
In the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.
Unless defined otherwise, all technical terms used in the examples of the present invention have the same meaning as commonly understood by one of ordinary skill in the art. Before further detailed description of embodiments of the invention, some terms used to understand examples of the invention are described.
In this context, "NVH" refers to Noise, Vibration, and Harshness, which are commonly understood as "Harshness" and occur simultaneously and inseparably in the mechanical Vibration of a vehicle, and therefore are often studied together, and simply all the tactile and auditory sensations of an occupant in a vehicle fall into the category of NVH studies, including the strength and life of vehicle parts due to Vibration.
In this context, reference to a "bench" is primarily to bench testing of a vehicle, which refers to performing certain simulated operational tests on a finished vehicle or parts or components of a vehicle.
In this document, the term "dynamometer" is a generic term for a combination of a dynamic measurement machine and a dummy load, and includes not only the dummy load but also a torquer and a measuring instrument, which can be used for testing a test object while loading the test object.
In order to make the technical solutions and advantages of the present invention clearer, the following will describe embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 is a block diagram of a stand for decomposing NVH of a powertrain according to an embodiment of the present invention; fig. 2 is a schematic structural view of a coaxiality limiting tool according to an embodiment of the invention.
As shown in fig. 1 and 2, the method for constructing the stand for measuring NVH of the power assembly according to the embodiment of the present invention includes:
centering the engine 1 and the first dynamometer 3, and connecting a flywheel of the engine 1 to one end of a rotating shaft of the first dynamometer 3 through the first transmission shaft 2;
the coaxiality limiting tool 5 is centered with the first dynamometer 3, a first end of a second transmission shaft 501 in the coaxiality limiting tool 5 is connected to the other end of a rotating shaft of the first dynamometer 3 through a flexible transmission shaft 4, a second end of the second transmission shaft 501 is connected to a gearbox 6, and the coaxiality limiting tool 5 is used for ensuring the coaxiality of the gearbox 6 and the first dynamometer 3;
a differential 7 is connected to the gearbox 6, the differential 7 being connected to a first end of an axle shaft 8, a second end of the axle shaft 8 being connected to a second dynamometer 9.
The method for building the stand for testing the NVH of the power assembly is characterized in that the engine 1 and the gearbox 6 are separated to test the NVH performance of the engine 1 or the NVH performance of the gearbox 6 independently, and particularly the test of the independent NVH performance of the engine 1 with the load of the gearbox 6 is achieved.
Under the condition that the coaxiality of the engine 1 and the first dynamometer 3 is guaranteed, the coaxiality between the first dynamometer 3 and the gearbox 6 is guaranteed through the coaxiality limiting tool, and further the coaxiality between the engine 1 and the gearbox 6 is guaranteed, so that signal synchronization of the engine 1 and the gearbox 6 is achieved, the NVH performance of the engine 1 can be tested independently under the condition that the load of the gearbox 6 is real, and the NVH performance of the engine 1 can be reflected more comprehensively and truly through the test result.
The alignment of the engine 1 and the first dynamometer 3 can be completed by using a laser alignment instrument, and a flywheel of the engine 1 is aligned with a rotating shaft of the first dynamometer 3 and then connected through the first transmission shaft 2. The coaxiality limiting tool 5 and the first dynamometer 3 can be centered by a laser centering instrument, after centering, the first end of the second transmission shaft 501 of the coaxiality limiting tool 5 is connected to the first dynamometer 3 through the flexible transmission shaft 4, and the second end of the second rotation shaft 501 of the coaxiality limiting tool 5 is connected to the gearbox 6, so that the coaxiality between the engine 1 and the gearbox 6 is ensured.
Wherein the first drive shaft 2 and the second drive shaft 501 are rigid shafts. The flexible transmission shaft 4 is, for example, a transmission shaft in which a metal core is covered with rubber. Due to the gear shifting action of the gearbox 6, the situation that the torque is too large may exist, the rotating shaft and the bearing inside the first dynamometer 3 may be damaged by the too large torque, and the service life of the rotating shaft and the bearing inside the first dynamometer 3 can be effectively protected by the buffering action of the flexible transmission shaft 4.
The differential mechanism 7 carries out locking control, so that the half shafts at the two ends realize synchronous rotating speed, the single half shaft 8 simulates the synchronization of two-wheel signals, and the acquisition module of the gearbox 6 is ensured to acquire correct rotating speed signals. The differential 7 may be equipped with a differential lock (not shown) to limit the slip of the differential 7. One end of the half shaft 8 is connected with the differential mechanism 7, and the other end of the half shaft 8 is connected with the second dynamometer 9.
The engine 1 outputs rotating speed and power, the first dynamometer 3 measures signals of the rotating speed, torque, power and the like of the engine 1, and meanwhile, the other end of the first dynamometer 3 drives the gearbox 6 to run. The load change (mainly torque change) of the transmission 6 is simulated by the second dynamometer 9. On the premise of realizing the functions, the noise acquisition sensor can be arranged in the space on the side of the engine 1 to carry out NVH test, so that the independent NVH test of the engine 1 with the load of the gearbox 6 is realized. Similarly, the NVH performance of the transmission 6 can be measured separately in the space on the transmission 6 side.
As shown in fig. 1 and 2, the bench built by the bench building method includes a first transmission shaft 2, a first dynamometer 3, a dynamometer mounting table (not shown in the figure), a coaxiality limiting tool 5, an engine mounting frame (not shown in the figure), a gearbox mounting frame (not shown in the figure) and a second dynamometer 9; the first dynamometer 3 is installed on a dynamometer installation table; the coaxiality limiting tool comprises a tool base frame and a second transmission shaft 501 arranged on the tool base frame; the engine mounting rack is suitable for placing an engine 1, the gearbox mounting rack is suitable for placing a gearbox 6, one end of a rotating shaft of the first dynamometer 3 is suitable for being connected with the engine 1 through the first transmission shaft 2, the other end of the rotating shaft of the first dynamometer 3 is connected with the first end of the second transmission shaft 501 through the flexible transmission shaft 4, and the second end of the second transmission shaft 501 is suitable for being connected with the gearbox 6; the first transmission shaft 2, the rotating shaft of the first dynamometer 3, the flexible transmission shaft 4 and the second transmission shaft 501 are positioned on the same axial line; a differential 7 is connected to the gearbox 6, the differential 7 is connected to a first end of an axle shaft 8, and a second end of the axle shaft 8 is connected to a second dynamometer 9.
The rack ensures the coaxiality between the first dynamometer 3 and the gearbox 6 through the coaxiality limiting tool under the condition of ensuring the coaxiality of the engine 1 and the first dynamometer 3, further ensures the coaxiality between the engine 1 and the gearbox 6, thereby realizing the signal synchronization of the engine 1 and the gearbox 6, independently testing the NVH performance of the engine 1 under the condition of having a load, namely the real gearbox 6, and more comprehensively and truly reflecting the NVH performance of the engine 1 through a test result.
The engine mount, gearbox mount and dynamometer mounting table are configured such that the positions of the engine 1, gearbox 6 and first dynamometer 3 in both the vertical and horizontal directions are adjustable to facilitate the necessary adjustments during the centering process.
The lower portion of the coaxiality-limiting tool 5 may be provided with a lifting mechanism (not shown in the drawings), which can adjust the height position of the coaxiality-limiting tool 5, and which is movable in the horizontal direction so as to adjust the position of the coaxiality-limiting tool 5 during the centering process.
As shown in fig. 2, the tooling pedestal includes a horizontal bottom plate 502, a vertical mounting plate 503, a positioning plate 504, a thrust bearing 505, and a bearing block 506.
The vertical mounting plate 503 is connected to the horizontal base plate 502 and perpendicular to the horizontal base plate 502, wherein the horizontal base plate 502 is horizontal to facilitate subsequent alignment of the coaxiality limiting tool 5 with the first dynamometer 3 and the transmission case 6.
The positioning plate 504 is connected to the vertical mounting plate 503, the positioning plate 504 can be positioned in the middle of the vertical mounting plate 503 by a positioning pin, and the surface of the positioning plate 504 and the surface of the vertical mounting plate 503 need to ensure good flatness so as to facilitate the installation and centering of other components.
The vertical mounting plate 503 is provided with a mounting hole, the positioning plate 504 is provided with a shaft hole 5041, and the shaft hole 5041 has a higher matching degree with the second transmission shaft 501, so that the second transmission shaft 501 can be better positioned in the shaft hole 5041.
When centering is performed, the shaft hole 5041 (see fig. 3a) on the positioning plate 504 can be centered with the rotating shaft of the first dynamometer 3 by using a laser centering instrument, the second transmission shaft 501 passes through the shaft hole 5041 of the positioning plate 504 and the mounting hole of the vertical mounting plate 503 and positions the second transmission shaft 501 through the shaft hole 5041 on the positioning plate 504, so that the coaxiality of the second transmission shaft 501 and the first dynamometer 3 can be ensured, and a certain protection effect can be exerted on the first dynamometer 3 by connecting a flexible shaft between the second transmission shaft 501 and the first dynamometer 3.
Specifically, the mounting holes on the vertical mounting plate 503 may be configured to have a larger size (may be larger than the shaft holes 5041 on the positioning plate 504), the positioning plate 504 is connected to the mounting holes on the vertical mounting plate 503, the shaft holes 5041 on the positioning plate 504 and the second transmission shaft 501 have a higher matching degree, the position of the positioning plate 504 on the vertical mounting plate 503 can be finely adjusted, so that only the position of the positioning plate 504 on the vertical mounting plate 503 needs to be adjusted when centering, after the shaft holes 5041 of the positioning plate 504 are centered with the first dynamometer 3, the positioning plate 504 is positioned on the vertical mounting plate 503 by the positioning pins, and then the second transmission shaft 501 is mounted in the shaft holes 5041, so that the coaxiality between the second transmission shaft 501 and the first dynamometer 3 can be ensured.
The thrust bearing 505 is disposed on the second transmission shaft 501, the bearing housing 506 of the thrust bearing 505 is disposed outside the thrust bearing 505, the positioning plate 504 is provided with four bearing housing holes 5042, and the bearing housing 506 is positioned and connected to the positioning plate 504 through the four bearing housing holes 5042.
As shown in fig. 3a and 3b, the coaxiality tolerance of the coaxiality limiting tool 5 requires that the coaxiality tolerance is less than or equal to 0.16 degrees (as shown in fig. 3 b), in this embodiment, the positioning plate 504 is a square plate (as shown in fig. 3a), and the ratio of the side length of the positioning plate 504 to the middle axis length of the second transmission shaft 501 is 1:2, according to the formula: the positioning tolerance requirement is equal to or less than 0.08 degrees, which is the coaxial tolerance requirement × 1/2, so that the coaxiality of the second transmission shaft 501 when positioned in the shaft hole 5041 can be further ensured by the positioning tolerance requirement between the four bearing housing holes 5042 of the positioning plate 504 and the shaft hole 5041 of the positioning plate 504 being less than or equal to 0.08 degrees.
As shown in fig. 2, the coaxiality limiting tool 5 further includes a gap adjusting shaft sleeve 507 and a flange 508, and the flange 508 is disposed at the second end of the second transmission shaft 501 and connected to the gap adjusting shaft sleeve 507 sleeved on the second transmission shaft 501.
The gap adjustment bush 507 and the second transmission shaft 501 are fixed to each other in the circumferential direction, and the gap adjustment bush 507 can move in the axial direction of the second transmission shaft 501 to adjust the position of the flange 508 in the axial direction of the second transmission shaft 501. The gap adjustment sleeve 507 is fixed to the second transmission shaft 501 in the circumferential direction by a flat key 509, and the position of the gap adjustment sleeve 507 in the axial direction of the second transmission shaft 501 is locked by a fastening bolt 510.
Illustratively, the transmission 6 in this embodiment is an automatic transmission, the flange 508 is connected to a torque converter in the transmission 6, the gap adjusting sleeve 507 can move on the second transmission shaft 501 in the axial direction, and the movement of the gap adjusting sleeve 507 drives the flange 508 connected to the gap adjusting sleeve 507 to move. The position of the hydraulic torque converter in the gearbox can be adjusted through the movement of the flange plate 508, so that the clearance between the hydraulic torque converter and the gearbox shell is adjusted, and interference friction between the hydraulic torque converter and the gearbox shell is avoided during rotation.
Since the gap adjusting bush 507 and the second transmission shaft 501 are fixed to each other in the circumferential direction, the gap adjusting bush 507 and the second transmission shaft 501 do not rotate relatively, but the gap adjusting bush 507 and the second transmission shaft 501 rotate synchronously.
The gap-adjusting bush 507 can be locked by the fastening bolt 510 after adjusting its position in the axial direction on the second transmission shaft 501. For example, a bolt hole may be provided in the gap adjustment sleeve 507, and the fastening bolt 510 may be locked in the bolt hole.
The coaxiality between the clearance adjusting sleeve 507 and the second transmission shaft 501 is also ensured when the flange 508 is connected with the gearbox 6. Only if the gap-adjusting sleeve 507 and the second transmission shaft 501 are located on the same axial line, the gap-adjusting sleeve 507 is perpendicular to the flange 508, and the contact surface where the gap-adjusting sleeve 507 and the flange 508 contact each other has good flatness, the coaxiality between the transmission case 6 and the second transmission shaft 501 can be ensured.
When the rack provided by the embodiment of the invention is used, the engine 1 and the gearbox 6 are separated to test the NVH performance of the engine 1 or the NVH performance of the gearbox 6 independently, and particularly the test of the NVH performance of the engine 1 with the load of the gearbox 6 is realized.
The engine 1 outputs rotating speed and power, the first dynamometer 3 measures signals of the rotating speed, torque, power and the like of the engine 1, and meanwhile, the other end of the first dynamometer 3 drives the gearbox 6 to run. The load change (mainly torque change) of the transmission 6 is simulated by the second dynamometer 9.
On the premise of realizing the functions, a noise acquisition sensor can be arranged in the space on the side of the engine 1 to perform NVH test, specifically, the oil injection noise, the engine idle speed jitter, the fan noise, the oil pump noise, the starter noise and the like under different working conditions can be tested through the load change of the gearbox 6, and the independent NVH test of the engine 1 with the load-real gearbox is realized. Similarly, the NVH performance of the transmission 6 can also be separately measured in the space on the side of the transmission 6, and the specific NVH test can be performed according to the specific test requirements of different vehicle types by a conventional method, which is not described herein again.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A rack building method for measuring NVH (noise, vibration and harshness) of a decomposed power assembly is characterized by comprising the following steps of:
centering an engine (1) and a first dynamometer (3), and connecting a flywheel of the engine (1) to one end of a rotating shaft of the first dynamometer (3) through a first transmission shaft (2);
the method comprises the steps that a coaxiality limiting tool (5) is centered with a first dynamometer (3), a first end of a second transmission shaft (501) in the coaxiality limiting tool (5) is connected to the other end of a rotating shaft of the first dynamometer (3) through a flexible transmission shaft (4), a second end of the second transmission shaft (501) is connected to a gearbox (6), and the coaxiality limiting tool (5) is used for ensuring the coaxiality of the gearbox (6) and the first dynamometer (3);
connecting a differential (7) to the gearbox (6), the differential (7) being connected to a first end of a half shaft (8), a second end of the half shaft (8) being connected to a second dynamometer (9);
the coaxiality limiting tool (5) comprises a tool base frame for mounting the second transmission shaft (501), and the tool base frame comprises a horizontal bottom plate (502), a vertical mounting plate (503), a positioning plate (504), a thrust bearing (505) and a bearing seat (506);
the vertical mounting plate (503) is connected to the horizontal bottom plate (502) and perpendicular to the horizontal bottom plate (502), the positioning plate (504) is connected to the vertical mounting plate (503), the vertical mounting plate (503) is provided with mounting holes, the positioning plate (504) is provided with shaft holes, the shaft holes in the positioning plate (504) are aligned with the rotating shaft of the first dynamometer (3), and the second transmission shaft (501) penetrates through the shaft holes in the positioning plate (504) and the mounting holes in the vertical mounting plate (503) and positions the second transmission shaft (501) through the shaft holes in the positioning plate (504);
the thrust bearing (505) is arranged on the second transmission shaft (501), and the bearing seat (506) is arranged outside the thrust bearing (505) and connected to the positioning plate (504).
2. The method for building the rack for decomposing the NVH (noise, vibration and harshness) of the power assembly according to claim 1, wherein the coaxiality limiting tool (5) further comprises a gap adjusting shaft sleeve (507) and a flange plate (508), the flange plate (508) is arranged at the second end of the second transmission shaft (501) and is connected with the gap adjusting shaft sleeve (507) sleeved on the second transmission shaft (501), the gap adjusting shaft sleeve (507) and the second transmission shaft (501) are fixed to each other in the circumferential direction, the gap adjusting shaft sleeve (507) can move in the axial direction of the second transmission shaft (501) to adjust the position of the flange plate (508) in the axial direction of the second transmission shaft (501), the gap adjusting shaft sleeve (507) is fixed to each other in the circumferential direction through a flat key (509) and the second transmission shaft (501), and the position of the gap adjusting shaft sleeve (507) in the axial direction of the second transmission shaft (501) is locked through a tightening bolt (510) .
3. The method for building the rack for testing the NVH of the power assembly according to claim 2, wherein the gap adjusting shaft sleeve (507) and the second transmission shaft (501) are located on the same axial line, and the gap adjusting shaft sleeve (507) is perpendicular to the flange (508).
4. The rack for measuring NVH (noise, vibration and harshness) of the decomposed power assembly is characterized by comprising a first transmission shaft (2), a first dynamometer (3), a dynamometer mounting table, a coaxiality limiting tool (5), an engine mounting frame, a gearbox mounting frame and a second dynamometer (9);
the first dynamometer (3) is installed on the dynamometer installation table;
the coaxiality limiting tool (5) comprises a tool base frame and a second transmission shaft (501) arranged on the tool base frame; the tool base frame comprises a horizontal bottom plate (502), a vertical mounting plate (503), a positioning plate (504), a thrust bearing (505) and a bearing seat (506);
the vertical mounting plate (503) is connected to the horizontal bottom plate (502) and perpendicular to the horizontal bottom plate (502), the positioning plate (504) is connected to the vertical mounting plate (503), the vertical mounting plate (503) is provided with mounting holes, the positioning plate (504) is provided with shaft holes, the shaft holes in the positioning plate (504) are aligned with the rotating shaft of the first dynamometer (3), and the second transmission shaft (501) penetrates through the shaft holes in the positioning plate (504) and the mounting holes in the vertical mounting plate (503) and positions the second transmission shaft (501) through the shaft holes in the positioning plate (504);
the thrust bearing (505) is arranged on the second transmission shaft (501), and the bearing seat (506) is arranged outside the thrust bearing (505) and connected to the positioning plate (504); the engine mounting frame is suitable for placing an engine (1), the gearbox mounting frame is suitable for placing a gearbox (6), one end of a rotating shaft of the first dynamometer (3) is suitable for being connected with the engine (1) through the first transmission shaft (2), the other end of the rotating shaft of the first dynamometer (3) is connected with a first end of the second transmission shaft (501) through a flexible transmission shaft (4), and a second end of the second transmission shaft (501) is suitable for being connected with the gearbox (6);
the first transmission shaft (2), the rotating shaft of the first dynamometer (3), the flexible transmission shaft (4) and the second transmission shaft (501) are positioned on the same axial line;
the differential (7) is connected to the gearbox (6), a first end of a half shaft (8) is connected to the differential (7), and a second end of the half shaft (8) is connected to a second dynamometer (9).
5. The NVH stand of claim 4, the coaxiality limiting tool (5) further comprises a clearance adjusting shaft sleeve (507) and a flange plate (508), the flange plate (508) is arranged at the second end of the second transmission shaft (501) and is connected with the gap adjusting shaft sleeve (507) sleeved on the second transmission shaft (501), the gap-adjusting bush (507) and the second transmission shaft (501) are fixed to each other in the circumferential direction, the gap-setting bush (507) can move in the axial direction of the second transmission shaft (501), to adjust the position of the flange plate (508) in the axial direction of the second transmission shaft (501), the gap-adjusting shaft sleeve (507) and the second transmission shaft (501) are fixed with each other in the circumferential direction through a flat key (509), and the position of the clearance adjusting shaft sleeve (507) in the axial direction of the second transmission shaft (501) is locked by a tightening bolt (510).
6. The NVH rack for the power assembly decomposition according to claim 5, wherein the clearance adjusting shaft sleeve (507) and the second transmission shaft (501) are located on the same axial line, and the clearance adjusting shaft sleeve (507) is perpendicular to the flange plate (508).
7. A method for testing NVH performance of an engine, characterized in that the test method is carried out by using the stand for testing NVH of the power assembly according to any one of claims 4 to 6.
8. A method for testing NVH performance of a gearbox, which is characterized by being carried out by using the stand for testing NVH of the power assembly according to any one of claims 4 to 6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011287115.5A CN112485002B (en) | 2020-11-17 | 2020-11-17 | Rack construction method, rack and test method for testing NVH (noise, vibration and harshness) of power assembly |
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| CN202011287115.5A CN112485002B (en) | 2020-11-17 | 2020-11-17 | Rack construction method, rack and test method for testing NVH (noise, vibration and harshness) of power assembly |
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| CN101738320B (en) * | 2008-11-06 | 2012-02-08 | 东风电动车辆股份有限公司 | Hybrid vehicle powertrain test system capable of simulating working condition and inertia |
| CN102998124B (en) * | 2011-09-08 | 2015-07-08 | 北汽福田汽车股份有限公司 | NVH (noise, vibration and harshness) semi-anechoic room test system and method |
| CN102680248B (en) * | 2012-05-16 | 2015-06-10 | 奇瑞汽车股份有限公司 | Test bench and mounting method and testing method thereof |
| CN103969051A (en) * | 2014-05-22 | 2014-08-06 | 中国北方发动机研究所(天津) | Diesel testbed of modular structure |
| US10520395B2 (en) * | 2016-08-17 | 2019-12-31 | Horiba Instruments Incorporated | Test stands for electric motor to be connected to front end accessory drive of internal combustion engine |
| CN107036812B (en) * | 2017-05-26 | 2023-08-22 | 吉林大学 | Electric motor car gearbox test bench |
| CN210464937U (en) * | 2019-07-12 | 2020-05-05 | 吉孚动力技术(中国)有限公司 | NVH performance test rack for automobile power assembly |
| CN111175048B (en) * | 2020-02-24 | 2022-02-22 | 中国第一汽车股份有限公司 | Engine performance benchmarking test system for automatic transmission vehicle and use method |
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